a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = (composite numbers).

A024370

a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = (composite numbers).

Terms

    a(0) =4a(1) =6a(2) =8a(3) =9a(4) =18a(5) =21a(6) =33a(7) =37a(8) =42a(9) =47a(10) =63a(11) =69a(12) =89a(13) =96a(14) =117a(15) =126a(16) =135a(17) =142a(18) =168a(19) =178a(20) =207a(21) =217a(22) =248a(23) =259a(24) =294a(25) =307a(26) =319a(27) =332a(28) =370a(29) =385

External references